I have a PTO generator for emergency power that I use with my other compact tractor. They take approximately 2 HP per KW of generator output, so your model should be fine for the cub. The problem will be getting this one to operate at the proper speed. The voltage output is contingent on it operating at the proper speed. My cub's speed rage is limited to about 4 distinct speeds, so you would have to do a good job of matching the pulleys to get the correct operating speed to get 120 volts (and not too much or too little). Good luck! A little geneator like that would be handy for a lot of applications where you need some portable power.

I am not sure of the math.. but you can get the rpms's set right by using different pulleys to bring it up. The Cub will vary from a low idle of 400 rpm to 1800 wide open, and probably around 750-1000 at mid-throttle? I should put the Stewart-Warner on Ellie one day and figure it out. Probably just a bit of experimentation to get it in the ball park. You might want to hook up some sort of RPM gauge to determine the rpms developed at the Generator

That generator will require about 6hp for full output. Plan to run the Cub engine at 1500 RPM or similar speed. Be aware that the normal AC power is 60Hz and is controlled by the generator speed. If the generator speed varies from 3600 rpm, the Hz of the output will vary. Some electrical devices, such as power tools, will not be affected by minor variations. Some electronic equipment may be affected. The POCO holds the Hz on their supply very precisely.

Use 1500 RPMs on the Cub's engine/PTO for your calculations for pulley sizes. This will give you a bit of "slop" since the commonly available pulley sizes may not come up to the exact caluclations.

The main problem will be getting the engine set at the RPMs need to power the generator. Not a big problem since the generator set has a volt meter. The problem comes in with the notches on the throttle quadrant.

Throttle set in last or next to last notch at about 1500 engine rpms. Put maximum load on the generator set. Check the voltage on the generator set and double check with a seperate volt meter. Adjust the throttle rod (called rod, governor connecting in parts manual) and clevis at the governor rock shaft to set the engine speed - to maintain the desired rpms/voltage.

Used a similiar process to put together a 10 KW generator set powered by a 25 hp Kohler engine.

The pulley on the Cub should be approximately twice the size as the one on the generator and you should be ok. Speed of the generator (really alternator) will set the cycles. When I worked on the Dew Line in the Aleutians we had two clocks on the power room wall. They were both AC syncronus clocks. One drew its power from the diesels we generated with and the other from a crystal supply used to set frequency for the Radar. If the clocks varied we sped up or slowed down the engines to keep the time in sync. We never varied by more than a second or two a week. We also checked with WWRL, the call of the Navel observatory if I remember it correctly.

Bill

"Life's tough.It's even tougher if you're stupid."- John Wayne

" We hang petty thieves and appoint the great ones to public office."- Aesop

I remember a discussion a while back about lack of lubrication for the bearings on the PTO shaft and transmission shaft when using the PTO and not driving the tractor. The bearings being oiled through the drip holes in the channel that catches the slung oil from the gears when driving. Am I not remembering correctly or could running the generator for a prolonged time eat a PTO bearing?

Scrivet wrote:Lack of lubrication for the bearings on the PTO shaft and transmission shaft when using the PTO and not driving the tractor.

Wouldn't hurt to give the PTO zerk a shot of grease ever couple of hours when running the generator.

That takes care of the one bearing in the rear of the trans but what about the front and center ones inside that are getting no oil. I've always wondered about this set up, there's no oil slinging gear built into the cub trans like say a Farmall A..Don't like it and I don't let mine set running out of gear very long.

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